MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Uživatelská příručka stáhnout pdf (Strana 209)

Image Enhancement

In this exam

ple, you used the Contrast Adjustment block to linearly

scale the p

ixel values in

pout.tif between new upper and lower limits.

You used th

e Histogram Equalization block to transform the values in

tire.tif s

o that the histogram of the output image approximately matches

a uniform

histogram. For more information, see the Contrast Adjustment

and Histo

gram Equalization block reference pages in the Video a nd Image

Processi

ng Blockset Reference.

Adjusti

ng the Contrast in Color Images

This exam

ple shows you how to modify the contrast in color images using

the Hist

ogram Equalization block.

1 Use the f

ollowing code to read in an indexed RGB image,

shadow.tif,and

convert

it to an R GB image.

[X map] = imread('shadow. tif');

shadow = ind2rgb(X,map );

2 Create a

new Simulink model, and add to it the blocks shown in the

followi

ng table.

7-53

1 2 ... 204 205 206 207 208 209 210 211 212 213 214 ... 251 252

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Uživatelská příručka Strana 209